fix: Use proper userId in taskprocessing trigger tests

Signed-off-by: Marcel Klehr <mklehr@gmx.net>

Author: marcelklehr

tests/lib/TaskProcessing/TaskProcessingTest.php

@@ -1305,12 +1305,12 @@ public function testTriggerableProviderWithOtherRunningTasks() {
 		$this->configureEventDispatcherMock(providersToAdd: [$externalProvider]);
 		$this->manager = $this->createManagerInstance();
 
-		$task = new Task($externalProvider->getTaskTypeId(), ['input' => ''], 'tests', 'foobar');
+		$task = new Task($externalProvider->getTaskTypeId(), ['input' => ''], 'tests', null);
 		$this->manager->scheduleTask($task);
 		$this->manager->lockTask($task);
 
 		// Act
-		$task = new Task($externalProvider->getTaskTypeId(), ['input' => ''], 'tests', 'foobar');
+		$task = new Task($externalProvider->getTaskTypeId(), ['input' => ''], 'tests', null);
 		$this->manager->scheduleTask($task);
 	}